Generosity isn’t so much about what you give, it’s about why you give.
It could be your time, or energy, it could be nothing material whatsoever, and if you give it with the intent of helping another, that’s generosity.
It could be just one dollar, but if that’s all you have to give and you thought it could help another, then that one dollar is invaluable generosity.
Generosity is an act, not an amount.
So give what you can, for the sake of compassion.